AC calorimetric study of magneto-quantum oscillations in anisotropic multiband V2Ga5 superconductor

Автор(и)

  • Ye. V. Petrenko Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences Košice 04001, Slovak Republic
    Centre of Low Temperature Physics, Faculty of Science, P. J. Šafárik University, Košice 04001, Slovak Republic
    B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine     https://orcid.org/0000-0003-0765-1845
  • J. Kačmarčík Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences Košice 04001, Slovak Republic https://orcid.org/0000-0002-3809-1679
  • T. Samuely Centre of Low Temperature Physics, Faculty of Science, P. J. Šafárik University, Košice 04001, Slovak Republic https://orcid.org/0000-0001-5618-6965
  • J. Haniš Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences Košice 04001, Slovak Republic https://orcid.org/0000-0002-3044-3932
  • S. Gabáni Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences Košice 04001, Slovak Republic https://orcid.org/0000-0002-6236-3427
  • S. Królak Faculty of Applied Physics and Mathematics and Advanced Materials Center, Gdansk University of Technology Gdańsk 80-233, Poland https://orcid.org/0000-0001-5463-2335
  • M. J. Winiarski Faculty of Applied Physics and Mathematics and Advanced Materials Center, Gdansk University of Technology Gdańsk 80-233, Poland https://orcid.org/0000-0001-9083-8066
  • T. Klimczuk Faculty of Applied Physics and Mathematics and Advanced Materials Center, Gdansk University of Technology Gdańsk 80-233, Poland https://orcid.org/0000-0002-7089-4631
  • M. Gmitra Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences Košice 04001, Slovak Republic https://orcid.org/0000-0003-1118-3028
  • P. Samuely Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences Košice 04001, Slovak Republic https://orcid.org/0000-0002-0370-4682

DOI (Low Temperature Physics):


https://doi.org/10.1063/10.0046911

Ключові слова:

quantum oscillations, Fermi surface, effective mass, Dingle temperature, Berry phase, superconductivity

Анотація

Unlike de Haas–van Alphen measurements, heat-capacity magneto-quantum oscillations (MQOs) directly probe the oscillatory bulk quasiparticle density of states. Here, we report the observation of MQOs in V2Ga5 sin gle crystals studied via highly sensitive ac calorimetry. The strongest MQO signal is observed for a magnetic field applied along the vanadium chains, in excellent agreement with de Haas–van Alphen magnetization data. A single dominant frequency of 126.6 T resolved by fast Fourier transform confirms the true bulk origin of the elliptical γ Fermi surface pocket located near the Z point of the Brillouin zone. The angular dependence of the fast Fourier transform frequency closely tracks the anisotropy of the γ pocket, as supported by first-principles calculations. Analysis of the temperature- and field-dependent MQO amplitudes allows for the precise deter mination of the effective cyclotron mass, Dingle temperature, quantum relaxation time, carrier mobility, and electron mean free path. Furthermore, we demonstrate that the net Berry flux is invariant with respect to the magnetic field orientation, a consequence of a conserved hybridization phase twist within the γ pocket. These findings establish ac calorimetry as a powerful macroscopic probe of topological orbital hybridization in complex intermetallics.

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Опубліковано

2026-09-28

Як цитувати

(1)
Ye. V. Petrenko, J. Kačmarčík, T. Samuely, J. Haniš, S. Gabáni, S. Królak, M. J. Winiarski, T. Klimczuk, M. Gmitra, and P. Samuely, AC calorimetric study of magneto-quantum oscillations in anisotropic multiband V2Ga5 superconductor , Low Temp. Phys. 52, 1377–1383, (2026) [Fiz. Nyzk. Temp. 52, 1527–1534, (2026)] DOI: https://doi.org/10.1063/10.0046911.

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Том 52 № 11 (2026)

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